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A binomial distribution has 72 trials with a probability of success of 0.25. We would like to find the probability of 19 or less successes

A binomial distribution has 72 trials with a probability of success of 0.25. We would like to find the probability of 19 or less successes using the normal distribution to approximate the binomial. What value should be used for x?

Answers:

19.5

18.5

15.5

20.5

Please explain the steps in words.

thank you

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